Depends on your setting, surely?
My own 20mm RPG, on the odd occasion we get a game in, is a blend (mish-mash?) of elements from Firefly, Killjoys, Babylon 5 and Dark Matter, among others.
In my universe pirates range from leather clad, tattooed, bling-laden gangbangers through lunatic cults seeking recruits or sacrifices for their deity to quasi-military types (mercs for hire doing a little private enterprise when times are lean) and on to aliens whose motives may be unclear but who may also fall in to one of the previous categories.
Growing old is mandatory, growing up is entirely optional!